﻿// Parts Copyright 2008 Newgrove Consultants Limited
// Modified By John Diss 
// From original work:
//
// Copyright 2006 - Ricardo Stuven (rstuven@gmail.com)
//
// This file is part of MsSqlSpatial.
// MsSqlSpatial is free software; you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation; either version 2 of the License, or
// (at your option) any later version.
// 
// MsSqlSpatial is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU Lesser General Public License for more details.

// You should have received a copy of the GNU Lesser General Public License
// along with MsSqlSpatial; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA 

using System.Data.SqlTypes;
using GeoAPI.Geometries;
using Microsoft.SqlServer.Server;
using MsSqlSpatial;

public partial class UserDefinedFunctions
{
    /// <summary> 
    /// Returns false if the <c>Geometry</c> not simple.
    /// Subclasses provide their own definition of "simple". If
    /// this <c>Geometry</c> is empty, returns <c>true</c>. 
    /// In general, the SFS specifications of simplicity seem to follow the
    /// following rule:
    ///  A Geometry is simple if the only self-intersections are at boundary points.
    /// For all empty <c>Geometry</c>s, <c>IsSimple==true</c>.
    /// </summary>
    /// <returns>    
    /// <c>true</c> if this <c>Geometry</c> has any points of
    /// self-tangency, self-intersection or other anomalous points.
    /// </returns>
    [SqlFunction(IsDeterministic = true)]
    public static SqlBoolean IsSimple(SqlBytes ewkb)
    {
        IGeometry geometry = ConvertGeometry.ToGeometry(ewkb);
        if (geometry != null)
            return new SqlBoolean(geometry.IsSimple);
        return SqlBoolean.Null;
    }
} ;